Ranked search through the provider's own full-text engine — FTS5 here is BM25, PostgreSQL
ts_rank, SQL Server FREETEXTTABLE, Oracle CONTAINS.
Scores are higher = more relevant and their scale is provider-specific, so compare
within a result set, not across backends.
The index is maintained by the database itself, so documents edited here are searchable
immediately — no rebuild, and nothing this tool can put out of step.
The language selector reaches PostgreSQL only, where it picks the to_tsquery
configuration. It must match the language the index was built with or the search quietly
matches nothing — every other backend ignores it.